Psystenance

Sustainability through the mind's eye

Archive for April, 2009

On the tipping point of buses

Posted by Michael Druker on April 28, 2009

No, we’re not going to go around tipping over buses. Though it would make a great urban legend to counter that rural legend of cow tipping.

There are plenty of bus routes in Kitchener-Waterloo — and in most cities that are not New York, I would imagine — that run every half-hour or less frequently. On the other hand, the “mainline” 7 buses run every 7-8 minutes along their common spine. I claim that the difference between a 30 minute and a 8 minute headway is not just in quantity, but also in quality. This might be obvious.

The difference is in how one may use such routes. For 30-minute buses, on average you’ll wait 15 minutes; but sometimes you have bad luck and the bus is running late, so a worst case is something like 40 minutes. These are 40 minutes that you could have used to walk to your destination. Which is pretty bad, so you get yourself a bus schedule and plan your time around the bus stop time. If you don’t get there sufficiently ahead of time, you still run the risk of the bus arriving early and screwing you over. The obvious way out is to avoid all this hassle with some other means of getting from point A to point B, such as driving.

Why is an 8-minute headway different? The answer should be clear: if you need to take the bus, you go to the bus stop and wait. On average, that’s a 4 minute wait. Worst case, 8 minutes, which is manageable. You don’t need the bus schedule! If you know where the bus goes, then you can just go to a stop and expect the bus to ferry you to your destination. It’s easy, requires no access to schedules or the Internet, and especially requires no advance planning. (With a short headway, the schedule might actually give you a false confidence due to inherent variability in the route.)

The bus headway tipping point is probably somewhere in between 5 and 30 minutes, and is some kind of average of individual patience curves. Around that tipping point, more buses will lead to disproportionately more riders and a more user-friendly bus route. The greater point is that there is a serious qualitative difference between low- and high-frequency service, and this deserves more prominence in discussion of transit.

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Introduction

Posted by Michael Druker on April 8, 2009

Hi there, and welcome to my blog. I’ve never run a non-personal blog, but I hope this will end up a worthwhile venture both for me and any readers that chance upon it. The topics that have led me here can be considered, more or less, to fall under the term sustainability. These include issues of food production, food systems, transit, and urban planning. The psy is for any contribution of my academic ties with the brain sciences. If I end up veering off course, the name is sufficiently ambiguous that it will likely still fit.

I’ve been interested in food for as long as I can remember. Not particularly unique, I know. My recent exploration of where that food comes from started with a MetaFilter link to a Michael Pollan article based on his In Defense of Food, which led me to the Omnivore’s Dilemma. Then Much Depends on Dinner, and more recently Fast Food Nation and the archives of Deconstructing Dinner. Living in Waterloo, Ontario, has given ample demonstration of viable local food systems through the local farmers’ markets and farmstands. I won’t even attempt to cite all the Internet sources of information.

My interest in transit comes partly from my familiarity with European models of it. After Moscow’s metro, no North American city’s transportation system compares. Similarly with European train travel versus North American automobile travel. This isn’t a proper justification, just a bit of a background.

Now, I am not entirely sure what this blog will end up comprising, but I intend for it to be a place where I can discuss ideas that come out from some of the above interests, and for other subjects that are outside of my academic research. It should help me to formulate ideas more clearly, and perhaps to come up with better ones.

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